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Finding the Fourth Proportional to 1,393.62, 2,090.39 and 571.28

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Solution

The fourth proportional to 1,393.62, 2,090.39 and 571.28 is: 856.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.62 : 2,090.39 = 571.28 : x
  2. Step 2: Convert to fraction form
    1,393.62/2,090.39 = 571.28/x
  3. Step 3: Cross multiply
    1,393.62x = 2,090.39 × 571.28
  4. Step 4: Simplify right side
    1,393.62x = 1,194,187.55
  5. Step 5: Solve for x
    x = 1,194,187.55/1,393.62
  6. Step 6: Final answer
    x = 856.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.